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Like a microscope or telescope, the optics in a kaleidoscope are used to enhance our vision in some way. Vision depends on light, and optics are used to control light by reflecting or bending it so that we can see in different ways. Kaleidoscopes use mirrors to reflect light into beautiful shapes and patterns.
What You Do:
You can also study reflection using two small square glass mirrors taped together on one side. Stand them upright and spread them apart like an open book, so that a small object can be placed between them without touching on either side. How many reflections do you see? Now, lay a pencil in front of the mirrors so that it touches on each side. How many pencils are reflected? Experiment with moving the mirrors closer to and further from each other; how does the number of reflected objects change in relation to the angle of the mirrors?